close.c

来自「ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机」· C语言 代码 · 共 111 行

/*
 * COPYRIGHT:        See COPYING in the top level directory
 * PROJECT:          ReactOS kernel
 * FILE:             drivers/fs/vfat/close.c
 * PURPOSE:          VFAT Filesystem
 * PROGRAMMER:       Jason Filby ([e-mail])
 */

/* INCLUDES *****************************************************************/

#define NDEBUG
#include "vfat.h"

/* FUNCTIONS ****************************************************************/

NTSTATUS
VfatCloseFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject)
/*
 * FUNCTION: Closes a file
 */
{
  PVFATFCB pFcb;
  PVFATCCB pCcb;
  NTSTATUS Status = STATUS_SUCCESS;

  DPRINT ("VfatCloseFile(DeviceExt %x, FileObject %x)\n",
	  DeviceExt, FileObject);

  /* FIXME : update entry in directory? */
  pCcb = (PVFATCCB) (FileObject->FsContext2);
  pFcb = (PVFATFCB) (FileObject->FsContext);

  if (pFcb == NULL)
  {
     return STATUS_SUCCESS;
  }

  if (pFcb->Flags & FCB_IS_VOLUME)
  {
     DPRINT1("Volume\n");
     pFcb->RefCount--;
     FileObject->FsContext2 = NULL;
  }
  else
  {
    if (FileObject->DeletePending)
    {
      if (pFcb->Flags & FCB_DELETE_PENDING)
      {
        VfatDelEntry (DeviceExt, pFcb);
      }
      else
      {
        Status = STATUS_DELETE_PENDING;
      }
    }
    vfatReleaseFCB (DeviceExt, pFcb);
  }

  FileObject->FsContext2 = NULL;
  FileObject->FsContext = NULL;
  FileObject->SectionObjectPointer = NULL;

  if (pCcb)
  {
    vfatDestroyCCB(pCcb);
  }

  return  Status;
}

NTSTATUS VfatClose (PVFAT_IRP_CONTEXT IrpContext)
/*
 * FUNCTION: Closes a file
 */
{
  NTSTATUS Status;

  DPRINT ("VfatClose(DeviceObject %x, Irp %x)\n", IrpContext->DeviceObject, IrpContext->Irp);

  if (IrpContext->DeviceObject == VfatGlobalData->DeviceObject)
    {
      DPRINT("Closing file system\n");
      Status = STATUS_SUCCESS;
      goto ByeBye;
    }
#if 0
  /* There occurs a dead look at the call to CcRosDeleteFileCache/ObDereferenceObject/VfatClose
     in CmLazyCloseThreadMain if VfatClose is execute asynchronous in a worker thread. */
  if (!ExAcquireResourceExclusiveLite (&IrpContext->DeviceExt->DirResource, IrpContext->Flags & IRPCONTEXT_CANWAIT))
#else
  if (!ExAcquireResourceExclusiveLite (&IrpContext->DeviceExt->DirResource, TRUE))
#endif
  {
     return VfatQueueRequest (IrpContext);
  }

  Status = VfatCloseFile (IrpContext->DeviceExt, IrpContext->FileObject);
  ExReleaseResourceLite (&IrpContext->DeviceExt->DirResource);

ByeBye:
  IrpContext->Irp->IoStatus.Status = Status;
  IrpContext->Irp->IoStatus.Information = 0;
  IoCompleteRequest (IrpContext->Irp, IO_NO_INCREMENT);
  VfatFreeIrpContext(IrpContext);

  return (Status);
}

/* EOF */